Conzerv-Support-FAQ-DM-32xx

DM3200 Meters
Questions
1.	Unpacking & storage
1.1.	Contents, Unpacking & Storage - Procedure and Precautions
2.	Clarifications
2.1	How to get clarifications on product/ product features?
2.2.	What is the technical difference between DM 3256 (3 phase Voltmeter) and DM 3257 (3 phase kilo Voltmeter)?
2.3.	What is the overload capacity of the DM 3258 (3 phase Ammeter) with a current input (Iin) of 1 Amp?
2.4.	What is the burden/loading due to the V & A inputs in the DM 32 series Meters?
2.5.	What is the range of Frequency DM3270 (Frequency Meter) reads and what is the accuracy?
2.6.	I have DM32 series Meter of Class 0.5 accuracy. The permissible error indicated in Test and Calibration certificate does not match to the accuracy class claimed. How is the permissible error calculated?
2.7.	I have DM3270 Frequency Meter with external signal option (Vin) of 415Volts. I would like to change the Vin to 110Volts. Can this be done?
2.8.	How is the reversal of polarity of input signal (Vin/Iin) indicated in DC Volts/ Amps meters?

Answers

Unpacking & Storage

1.1.

Contents, Unpacking & Storage - Procedure and Precautions

1.1.1.

Packed carton box contains - Limited Warranty Certificate, Test and Calibration certificate.

1.1.2.

First check the carton for signs of damage or liquid spills. If any damage is found, then you must lodge a claim with the transporter. In this case, please contact the transporter before proceeding with the unpacking; he may want his agent to be present. Please also read the Conzerv Limited Warranty certificate received with the meter.

1.1.3.

Do not remove the protective plastic cover of your new instruments until the time of installation. Preserve the packing material. This will be required if the instrument needs to be shipped later for service or calibration.

Clarifications

2.1.

How to get clarifications on product/ product features?

2.1.1.

Call nearest contact point of Schneider Electric Conzerv for assistance

2.1.2.

Call our dealers across India, UAE, Thailand, Malaysia, Indonesia, Australia and Singapore. Visit our Products & Services section for more details.

2.1.3.

Call 1800 425 0555 (Toll Free No. - allover India) for on line assistance.

2.1.4.

Write to contact@conzerv.com for details

2.2.

What is the technical difference between DM 3256 (3 phase Voltmeter) and DM 3257 (3 phase kilo Voltmeter)?

2.2.1.

Both of these Meters have 3-digit display only.

2.2.2.

For DM3256 the Voltage signal input (Vin) is 415Volts nominal. If the Vin is

exceeding 415 Volts, the voltage will be considered in kV range. The Meter

model becomes DM3257 with 3-digit display and the Meter is manufactured accordingly.

2.2.3.

However if the customer specifically ordered for Voltmeter with 31/2 digit

display where the Line Voltage is up to 1600Volts, then Vin to the Meter

should be 110 Volts. User should use a PT to step down the line voltage to 110Volts. This Meter will be supplied on specific request only.

2.3.

What is the overload capacity of the DM 3258 (3 phase Ammeter) with. a Current input (Iin) of 1 Amp?

2.3.1.

Till 120% overloads, the accuracy specified will be met. Above this, accuracy starts gradually degrading and cannot be specified.

2.3.2.

At a point between150% to 200% overload the display saturates (stopsincreasing linearly with increasing input current). This point of saturation will vary for CT ratio setting and also from meter to meter).

2.3.3.

At overload of 6 times of the nominal current (i.e. 6 Amps. in this case) the

internal CT saturates. The protective circuit (secondary clamping) comes

into effect. The Meter can withstand this overload for 3 minutes at a time,

without any damage. After this overload the meter needs to cool down to

ambient temperature before applying the next overload. For overload of 6

Amps for 3 minutes, about 20 to 30 minutes of cooling time is required. For smaller overloads, the cooling time will be proportionately less. However this overloaded value will not be displayed on the Meter

2.4.

What is the burden/loading due to the V & A inputs in the DM 32 series Meters?

2.4.1.

The burden/loading is 0.2 VA per Volt and Amp. per phase.

2.5.

What is the range of Frequency DM3270 (Frequency Meter) reads

and what is the accuracy?

2.5.1.

DM3270 Frequency Meter reads the line frequency from 20.00 to 99.99 and this Meter has 4-digit display.

2.5.2.

DM3270 Meter has the accuracy of 0.2

2.6.

I have DM3270 Frequency Meter with external signal option (Vin) of

415Volts. I would like to change the Vin to 110Volts. Can this be done?

2.6.1.

Change of Vin is not required, as the Meter with external signal option works for the Vin range of 40 Volts to 600 Volts (though the Vin is mentioned as 415V).

2.7.

I have DM32 series Meter of Class 0.5 accuracy. The permissible errorindicated in Test and Calibration certificate does not match to theaccuracy class claimed. How is the permissible error calculated?

2.7.1.

The chart below gives details of accuracy definition and method to calculate permissible error.

Meter Model	Class of accuracy	Permissible error definition	How this is arrived at
DM32xx (except Hz Meter)	1.0	1 % of Full scale+1 count	Eg: +/- 9 counts for full scale of 800 KW/KVA.
DM32xx (except Hz Meter)	0.5	0.5 % of Full scale+1 count	Eg: +/- 5 counts for full scale of 800 KW/KVA.
DM32xx Hz Meter	0.2	0.2 % of Full scale+1 count	Eg: +/- 21 counts for full scale of 99.99 Hz

2.7.2.

For digital readouts error is calculated in counts. Eg: Full Scale of 800 A corresponds to 800 counts.

2.8.

How is the reversal of polarity of input signal (Vin/Iin) indicated in DCVolts/ Amps meters?

2.8.1.

Negative sign is indicated on display if input signal is reversed.